Introduction
============
.. image:: https://readthedocs.org/projects/adafruit-circuitpython-mcp230xx/badge/?version=latest
:target: https://docs.circuitpython.org/projects/mcp230xx/en/latest/
:alt: Documentation Status
.. image:: https://raw.githubusercontent.com/adafruit/Adafruit_CircuitPython_Bundle/main/badges/adafruit_discord.svg
:target: https://adafru.it/discord
:alt: Discord
.. image:: https://github.com/adafruit/Adafruit_CircuitPython_MCP230xx/workflows/Build%20CI/badge.svg
:target: https://github.com/adafruit/Adafruit_CircuitPython_MCP230xx/actions/
:alt: Build Status
.. image:: https://img.shields.io/badge/code%20style-black-000000.svg
:target: https://github.com/psf/black
:alt: Code Style: Black
CircuitPython module for the MCP23017/08 I2C and MCP23S17/08 SPI I/O extenders.
Dependencies
=============
This driver depends on:
* `Adafruit CircuitPython <https://github.com/adafruit/circuitpython>`_
* `Bus Device <https://github.com/adafruit/Adafruit_CircuitPython_BusDevice>`_
Please ensure all dependencies are available on the CircuitPython filesystem.
This is easily achieved by downloading
`the Adafruit library and driver bundle <https://github.com/adafruit/Adafruit_CircuitPython_Bundle>`_.
Installing from PyPI
====================
On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally `from
PyPI <https://pypi.org/project/adafruit-circuitpython-mcp230xx/>`_. To install for current user:
.. code-block:: shell
pip3 install adafruit-circuitpython-mcp230xx
To install system-wide (this may be required in some cases):
.. code-block:: shell
sudo pip3 install adafruit-circuitpython-mcp230xx
To install in a virtual environment in your current project:
.. code-block:: shell
mkdir project-name && cd project-name
python3 -m venv .venv
source .venv/bin/activate
pip3 install adafruit-circuitpython-mcp230xx
Usage Example
=============
See examples/mcp230xx_simpletest.py for a demo of the usage.
Documentation
=============
API documentation for this library can be found on `Read the Docs <https://docs.circuitpython.org/projects/mcp230xx/en/latest/>`_.
For information on building library documentation, please check out `this guide <https://learn.adafruit.com/creating-and-sharing-a-circuitpython-library/sharing-our-docs-on-readthedocs#sphinx-5-1>`_.
Warning
=======
Some people have reported an undocumented bug that can potentially corrupt the I2C bus.
It occurs if an MCP230XX input pin state changes during I2C readout. **This should be very rare.** For more information, see this `forum post <https://www.microchip.com/forums/m646539.aspx>`_ and this `knowledge base article <https://microchipsupport.force.com/s/article/On-MCP23008-MCP23017-SDA-line-change-when-GPIO7-input-change>`_ .
Contributing
============
Contributions are welcome! Please read our `Code of Conduct
<https://github.com/adafruit/Adafruit_CircuitPython_MCP230xx/blob/main/CODE_OF_CONDUCT.md>`_
before contributing to help this project stay welcoming.
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